EP0224082A2 - Configuration de circuit à coefficient d'amplification réglable - Google Patents

Configuration de circuit à coefficient d'amplification réglable Download PDF

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Publication number
EP0224082A2
EP0224082A2 EP86115308A EP86115308A EP0224082A2 EP 0224082 A2 EP0224082 A2 EP 0224082A2 EP 86115308 A EP86115308 A EP 86115308A EP 86115308 A EP86115308 A EP 86115308A EP 0224082 A2 EP0224082 A2 EP 0224082A2
Authority
EP
European Patent Office
Prior art keywords
transistor
circuit arrangement
transistors
circuit
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86115308A
Other languages
German (de)
English (en)
Other versions
EP0224082A3 (fr
Inventor
Gerald Dipl.-Ing. Gronau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0224082A2 publication Critical patent/EP0224082A2/fr
Publication of EP0224082A3 publication Critical patent/EP0224082A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Definitions

  • the invention relates to a circuit arrangement according to the type of the main claim.
  • the circuit arrangement according to the invention with the characterizing features of the main claim has the advantage that good synchronization of the gain factors in the three channels R, G, B is possible in the entire setting range. Furthermore, is particularly before geous that the circuit arrangement according to the invention is DC-controlled, whereby it is avoided that video signal lines are routed to a possibly remote operating device. It can also be set from a computer via a digital / analog converter. Finally, for the average beam current limitation of a monitor, a control signal can be derived which also acts on the circuit arrangement according to the invention.
  • circuit arrangement according to the invention has the following advantages: It can be used universally, has a low power consumption and requires little space and is suitable for frequencies of up to over 100 MHz.
  • the amplification factor can be set in three channels R, G and B.
  • the circuits of the three channels R, G, B are identical.
  • the two emitter-coupled transistors 21 and 22, to which current is supplied via a resistor 25 and a third transistor 23, are used to set the gain factor.
  • the transistor 21 has a load resistor 26, while the transistor 22 is connected directly to the positive pole 17 of the operating voltage source.
  • the base of transistor 22 is connected together with the base connections of transistors 32 and 42 of channels G and B via connection 20 to a voltage source, not shown, which supplies a constant bias voltage.
  • the collector of transistor 21 is connected to output 2 of channel R via a transistor 24 connected as an emitter follower. Finally, the base connection of the transistor 24 is led to a further input 1 of the channel R.
  • the other channels are identical and include transistors 31, 32, 33 and 34 and resistors 35 and 36 in the case of channel G and transistors 41, 42, 43 and 44 and resistors 45 and 46 in the case of channel B.
  • the base connections of the transistors 22, 32 and 42 are connected together to the connection 20 for supplying a constant bias voltage and via the resistor 47 to ground potential.
  • the basic connections of the transistors 21, 31 and 41 are connected via a resistor 48 to a connection 18 for supplying the setting voltage for the amplification or contrast, which is further connected to ground potential via a resistor 50.
  • the circuit arrangement according to FIG. 1 also includes a capacitor 53, which blocks the operating voltage against ground potential (terminal 5) and a voltage divider 51, 52 for generating a bias voltage (terminal 16) for the clamping circuits described in connection with FIG. 2.
  • the current through transistor 23 (or 33 and 43) is now controlled in accordance with the voltage supplied at 3, that is to say in accordance with the respective color value signal.
  • the negative feedback resistor 25 ensures sufficient linearity.
  • the current thus corresponding to the color value signal is divided between the emitter-collector paths of the transistors 21 and 22.
  • the part which flows through the transistor 21 results in a voltage drop across the load resistor 26, which corresponds to the color value signal multiplied by the proportion of the current through the transistor 21.
  • this portion can be controlled from 0 to 1 using the base voltages of transistors 21 and 22.
  • This control now takes place in that the base of the transistor 22 and also the base connections of the transistors 32 and 42 are supplied with constant potential via the connection 20.
  • the base of the transistor 21 receives, together with the base connections of the transistors 31 and 41, a control voltage which is supplied at 18 and is reduced using the voltage divider 48, 49.
  • the voltage divider 48, 49 is provided.
  • FIG. 2 shows a supplement to the circuit arrangement according to FIG. 1, the circuit arrangement according to FIG. 1 being shown schematically as a hybrid circuit 61.
  • the operating voltage is the terminal 17 of the hybrid circuit 61 from a pole 62 Operating voltage source supplied and is blocked by two capacitors 63, 64.
  • the color value signals R, G, B are each fed to a clamping circuit via the inputs 65, 66, 67, which are connected to terminating resistors 68, 69, 70.
  • the clamping circuits each consist of a capacitor 71, 72, 73 and a diode 74, 75, 76 in a manner known per se.
  • the clamping potential is obtained from the hybrid circuit 61 (connection 16).
  • a capacitor 77 serves to block the clamping voltage.
  • Outputs 78, 79, 80 for the amplitude-adjustable color value signals R, G, B and load resistors 81, 82, 83 are connected to the connections 2, 7 and 12 of the hybrid circuit 61.
  • Two additional transistors 84, 85 are used to supply the set voltage and the bias voltage, the collectors of which are connected to the positive pole of the operating voltage source and the emitters of which are connected to the respective connection of the hybrid circuit 61.
  • the base of transistor 84 is supplied with a constant potential with the aid of a voltage divider 86, 87, while the base of transistor 85 is supplied with the set voltage supplied at 90 via a low-pass element, which consists of a resistor 88 and a capacitor 89.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Picture Signal Circuits (AREA)
EP86115308A 1985-11-16 1986-11-05 Configuration de circuit à coefficient d'amplification réglable Withdrawn EP0224082A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540752 DE3540752A1 (de) 1985-11-16 1985-11-16 Schaltungsanordnung mit steuerbarem verstaerkungsfaktor
DE3540752 1985-11-16

Publications (2)

Publication Number Publication Date
EP0224082A2 true EP0224082A2 (fr) 1987-06-03
EP0224082A3 EP0224082A3 (fr) 1989-03-29

Family

ID=6286207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115308A Withdrawn EP0224082A3 (fr) 1985-11-16 1986-11-05 Configuration de circuit à coefficient d'amplification réglable

Country Status (3)

Country Link
US (1) US4731653A (fr)
EP (1) EP0224082A3 (fr)
DE (1) DE3540752A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332367A2 (fr) * 1988-03-09 1989-09-13 Rockwell International Corporation Amplificateur à réglage automatique du gain à gamme de proportionalité étendue
US6565318B1 (en) 1999-03-29 2003-05-20 Siemens Aktiengesellschaft Cast gas turbine blade through which coolant flows, together with appliance and method for manufacturing a distribution space of the gas turbine blade

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2058286A1 (de) * 1969-11-26 1971-06-03 Motorola Inc Farbsignalverarbeitende Stufe fuer Fernsehempfaenger
DE2846706A1 (de) * 1977-10-26 1979-05-23 Sanyo Electric Co Farbartsignal-verarbeitungsschaltung in einem farbfernsehempfaenger

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638131A (en) * 1969-09-29 1972-01-25 Nat Semiconductor Corp Multiplexing circuit with stage isolation means
US3619797A (en) * 1970-01-21 1971-11-09 Globe Universal Sciences Operational amplifier
US3846710A (en) * 1973-02-02 1974-11-05 Motorola Inc Dc restoration amplifier with automatic zero offset adjustment
NL165617C (nl) * 1974-12-18 1981-04-15 Philips Nv Televisiebeeldweergeefinrichting met een video- versterker.
DE2651482C3 (de) * 1975-11-14 1980-05-29 Shin-Shirasuna Electric Corp., Nagoya, Aichi (Japan) Verstärkerschaltung
JPS5280734A (en) * 1975-12-27 1977-07-06 Sony Corp Tv picture receiver
US4143398A (en) * 1978-03-22 1979-03-06 Rca Corporation Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals
US4266204A (en) * 1979-09-04 1981-05-05 Sperry Rand Corporation Delay line signal equalizer for magnetic recording signal detection circuits
JPS5748815A (en) * 1980-09-08 1982-03-20 Sanyo Electric Co Ltd Picture quality adjusting circuit
JPS6049987B2 (ja) * 1980-12-22 1985-11-06 日本ビクター株式会社 Ｆｍ復調回路
US4350995A (en) * 1981-04-20 1982-09-21 Rca Corporation Self-limiting video signal peaking circuit
JPS5885605A (ja) * 1981-11-17 1983-05-23 Pioneer Electronic Corp 中間周波増幅回路
US4504853A (en) * 1981-11-25 1985-03-12 Faroudja Y C Enhancement of quadrature modulated chroma by luminance or chroma transitions without chroma demodulation
JPS58133048A (ja) * 1982-02-02 1983-08-08 Pioneer Electronic Corp 受信機のシグナルメ−タ駆動回路
JPS58164387A (ja) * 1982-03-24 1983-09-29 Casio Comput Co Ltd 映像信号ａ−ｄ変換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2058286A1 (de) * 1969-11-26 1971-06-03 Motorola Inc Farbsignalverarbeitende Stufe fuer Fernsehempfaenger
DE2846706A1 (de) * 1977-10-26 1979-05-23 Sanyo Electric Co Farbartsignal-verarbeitungsschaltung in einem farbfernsehempfaenger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TECHNICAL NOTES, 17. September 1974, Seiten 1-3, Princeton, New York, US; J. McINTIRE YONGUE: "Electronic amplitude control of the brightness property of a color tv picture" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332367A2 (fr) * 1988-03-09 1989-09-13 Rockwell International Corporation Amplificateur à réglage automatique du gain à gamme de proportionalité étendue
EP0332367A3 (fr) * 1988-03-09 1991-01-30 Rockwell International Corporation Amplificateur à réglage automatique du gain à gamme de proportionalité étendue
US6565318B1 (en) 1999-03-29 2003-05-20 Siemens Aktiengesellschaft Cast gas turbine blade through which coolant flows, together with appliance and method for manufacturing a distribution space of the gas turbine blade

Also Published As

Publication number Publication date
US4731653A (en) 1988-03-15
DE3540752A1 (de) 1987-05-21
EP0224082A3 (fr) 1989-03-29

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Inventor name: GRONAU, GERALD, DIPL.-ING.